What is the primary function of a CPR valve? Prevents compressor overload during hot pull-down.Click to see full answer. Thereof, what is the primary function of an EPR valve?The primary function of an EPR is to prevent the evaporator pressure from falling below a predetermined value or setting. A consistent evaporating temperature is maintained at the valve setting as evaporator loads decrease.Likewise, what is a CPR valve refrigeration? A crankcase pressure regulator (CPR) is a common accessory added to many low-temperature refrigeration applications, such as walk-in and reach-in freezers. They are designed to prevent the compressor’s motor from overloading when its crankcase pressure rises above its designed working pressure. In this way, what controls the pump down solenoid? A system pump down utilizes a solenoid valve in the liquid line, when the system set-point temperature has been satisfied, the solenoid valve will close. The compressor will continue to pump refrigerant into the condenser and/or receiver, drawing it from the low side of the system.What does a crankcase pressure regulator do quizlet?It stands for crankcase pressure-regulating valve. It is in the suction line close to the compressor and is used to keep low-temperature compressors from overloading during a hot pulldown.